Method of manufacturing pneumatic tire, shaping device and pneumatic tire

Patent metadata

Field	Value
Publication number	US-2016332401-A1
Application number	US-201615148476-A
Country	US
Kind code	A1
Filing date	May 6, 2016
Priority date	May 11, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A method of manufacturing a pneumatic tire includes forming a green case by cylindrically winding a tire component member which includes at least one layer of a carcass ply. A green tire is shaped by expanding the green case into a toroidal shape with the supply of a fluid into the green case so that the green case adheres to a tread ring arranged radially outside the green case. The green tire is subjected to vulcanization molding within a mold die. During the shaping of the green tire, the fluid is supplied in accordance with a pressure profile which changes in a stepwise manner. The pressure profile is set such that a former stage pressure which is a pressure in a stage preceding a final stage is set lower than a final stage pressure which is a pressure in the final stage.

First claim

What is claimed is:

1 . A method of manufacturing a pneumatic tire including:
forming a green case by cylindrically winding a tire component member which includes at least one layer of a carcass ply; shaping a green tire by expanding the green case into a toroidal shape with the supply of a fluid into the green case so that the green case adheres to a tread ring arranged radially outside the green case; and subjecting the green tire to vulcanization molding within a mold die, wherein during the shaping of the green tire, the fluid is supplied in accordance with a pressure profile which changes in a stepwise manner, and the pressure profile is set such that a former stage pressure which is a pressure in a stage preceding a final stage is set lower than a final stage pressure which is a pressure in the final stage.

2 . The method of manufacturing a pneumatic tire according to claim 1 , wherein the pressure profile is set such that an initial pressure in an initial stage differs from both the former stage pressure and the final stage pressure.

3 . The method of manufacturing a pneumatic tire according to claim 2 , wherein the initial pressure is higher than both the former stage pressure and the final stage pressure.

4 . The method of manufacturing a pneumatic tire according to claim 1 , wherein the pressure profile is set such that an initial pressure in an initial stage is equal to the former stage pressure.

5 . A green tire shaping device comprising a fluid supply part which expands a green case formed by cylindrically winding a tire component member including at least one layer of a carcass ply into a toroidal shape with the supply of a fluid into the green case so that the green case adheres to a tread ring arranged radially outside the green case, wherein
the fluid supply part is configured to supply the fluid in accordance with a pressure profile which changes in a stepwise manner, and the pressure profile is set such that a former stage pressure which is a pressure in a former stage preceding a final stage is set lower than a final stage pressure which is a pressure in the final stage.

6 . A pneumatic tire manufactured such that a green case is formed by cylindrically winding a tire component member including at least one layer of a carcass ply, the green case is expanded into a toroidal shape with the supply of a fluid into the green case so that the green case adheres to a tread ring arranged radially outside the green case thus shaping a green tire, and the green tire is subject to vulcanization molding within the mold die, wherein
the fluid is supplied in accordance with a pressure profile which changes in a stepwise manner, and the pressure profile is set such that a former stage pressure which is a pressure in a former stage preceding a final stage is set lower than a final stage pressure which is a pressure in the final stage.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Nagai Kunihiko

Classifications

• B29D30/58

  Applying bands of rubber treads, i.e. applying camel backs · CPC title

• B29D30/20 Primary

  by the flat-tyre method, i.e. building on cylindrical drums · CPC title

• B29D30/0601

  Vulcanising tyres; Vulcanising presses for tyres · CPC title

• B29D30/30

  Applying the layers; Guiding or stretching the layers during application {(applying tread bands to carcasses B29D30/58; retreading B29D30/54)} · CPC title

• B29D2030/3078

  the layers being applied being substantially continuous, i.e. not being cut before the application step · CPC title